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Souza M, Machado J, da Silva J, Ramos L, Nogueira L, Ribeiro P, Dias D, Santos J, Santos JC, Nóbrega Y, Souza A, Freitas S, da Paz MC, Felipe M, Torres F, Galdino A. Rational design and evaluation of the recombinant multiepitope protein for serodiagnosis of rubella. Curr Pharm Biotechnol 2021; 23:1094-1100. [PMID: 34493182 DOI: 10.2174/1389201022666210907170921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 06/28/2021] [Accepted: 07/04/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Rubella is an infection caused by rubella virus (RV) and is generally regarded as a mild childhood disease. The disease continues to be of public health importance mainly because when the infection is acquired during early pregnancy it often results in fetal abnormalities, which are classified as congenital rubella syndrome (CRS). An accurate diagnosis for rubella is thus of pivotal importance for proper treatment. OBJECTIVE To produce a recombinant multiepitope protein (rMERUB) for the diagnosis of rubella, based on conserved immunodominant epitopes of glycoprotein E1 and E2. METHODS A synthetic gene was designed and cloned into vector pET21a with a 6xHis tag at the C-terminal for affinity purification and overexpressed in Escherichia coli cells. Biophysical analysis of rMERUB was performed by circular dichroism. Biological activity was assessed using an in-house ELISA assay. RESULTS Expression in Escherichia coli showed a ~22 kDa protein that was purified and used to perform structural assays and an IgG ELISA. Structural analyses reveal rMERUB has a β leaf pattern that promotes the exposure of epitopes, thus allowing antibody recognition. Evaluation of 33 samples (22=positive; 11=negative) was performed using in-house ELISA and this was compared with a commercial kit. The sensitivity was 100% (95% CI: 85-100) and specificity 90.91% (95% CI: 62-99). Excellent agreement (Kappa index = 0.9) was obtained between ELISA assays. CONCLUSIONS The careful choice of epitopes and the high epitope density, coupled with simple-step purification, pinpoints rMERUB as a promising alternative for rubella diagnosis, with potential for the development of a diagnostic kit.
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Affiliation(s)
- Marilen Souza
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Departamento de Biologia Celular, Universidade de Brasília, Brasília, 70910-900, Brasília, DF. Brazil
| | - Juliana Machado
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, 35501-296, Divinópolis, MG. Brazil
| | - Jonatas da Silva
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, 35501-296, Divinópolis, MG. Brazil
| | - Luana Ramos
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, 35501-296, Divinópolis, MG. Brazil
| | - Lais Nogueira
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, 35501-296, Divinópolis, MG. Brazil
| | - Patrícia Ribeiro
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, 35501-296, Divinópolis, MG. Brazil
| | - Daniel Dias
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, 35501-296, Divinópolis, MG. Brazil
| | - Josiane Santos
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, 35501-296, Divinópolis, MG. Brazil
| | - José Carlos Santos
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Departamento de Biologia Celular, Universidade de Brasília, Brasília, 70910-900, Brasília, DF. Brazil
| | - Yanna Nóbrega
- Laboratório de Doenças Imunogenéticase Crônico-degenerativas, Faculdade de Saúde, Departamento de Ciências Farmacêuticas, Universidade de Brasília. Brazil
| | - Amanda Souza
- Laboratório de Biofísica, Instituto de Ciências Biológicas, Departamento de Biologia Celular, Universidade de Brasília. Brazil
| | - Sonia Freitas
- Laboratório de Biofísica, Instituto de Ciências Biológicas, Departamento de Biologia Celular, Universidade de Brasília. Brazil
| | - Mariana Campos da Paz
- Laboratório de Nanobiotecnologia & Biativos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, Divinópolis, MG, 35501-296. Brazil
| | - Maria Felipe
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Departamento de Biologia Celular, Universidade de Brasília, Brasília, 70910-900, Brasília, DF. Brazil
| | - Fernando Torres
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Departamento de Biologia Celular, Universidade de Brasília, Brasília, 70910-900, Brasília, DF. Brazil
| | - Alexsandro Galdino
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São João Del-Rei, campus Centro-Oeste Dona Lindu, 35501-296, Divinópolis, MG. Brazil
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Wang Q, Pu G, Tang G, Lu X, Wang G, Du Q, Zhang G, Guo X. Mechanism of heparin interference in detection of LIAISON® Rubella IgM. Clin Chim Acta 2020; 511:7-13. [PMID: 32950518 DOI: 10.1016/j.cca.2020.09.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 09/15/2020] [Indexed: 11/16/2022]
Abstract
AIMS To investigate the effects of heparin in detection of LIAISON® Rubella IgM (Rub-M) and the mechanism of interference. METHODS Different concentrations of lithium heparin and sodium heparin were added to ten serum samples. The relative light units (RLU) value of Rub-M was measured using the LIAISON XL detection system. Different levels of IgM serum were incubated with magnetic particle in Rub-M detection kit at 4 °C for 4 h, blocking anti-human IgM-specific antibodies coated on the surface of magnetic particle. Separately, the rubella virus antigen in Rub-M detection kit was replaced by phosphate-buffered saline (PBS). The RLU values of LIAISON® Rub-M of original serum and serum containing various concentrations of heparin were measured after the above two different treatments. RESULTS The RLU value of LIAISON® Rub-M increased with the increase of heparin content lower than 40 IU/mL, and reached a peak value at 40-50 IU/mL. The RLU value of LIAISON® Rub-M then decreased with the decrease of heparin concentration. When rubella virus antigen was replaced by PBS, the RLU value of LIAISON® Rub-M of serum samples containing 40 IU/mL heparin decreased significantly. The blocking concentration of IgM increased gradually, and the RLU value of LIAISON® Rub-M of seven serum samples containing 40 IU/mL heparin also decreased gradually. CONCLUSION Plasma with heparin cannot be used to the detection of LIAISON® Rub-M. Heparin may participate in the reaction by binding with rubella virus antigen and anti-human IgM-specific antibodies coated on the surface of magnetic particle, thus affecting the detection results.
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Affiliation(s)
- Qiang Wang
- Department of Laboratory Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China; Department of Laboratory Medicine, North Sichuan Medical College, Nanchong, Sichuan 637000, China; Translational Medicine Research Center, North Sichuan Medical College, Nanchong, Sichuan 637000, China
| | - Guihong Pu
- Department of Laboratory Medicine, Leshan Hospital of Traditional Chinese Medicine, Leshan, Sichuan 614000, China
| | - Guohui Tang
- Department of Laboratory Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China
| | - Xiaolan Lu
- Department of Laboratory Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China; Department of Laboratory Medicine, North Sichuan Medical College, Nanchong, Sichuan 637000, China; Translational Medicine Research Center, North Sichuan Medical College, Nanchong, Sichuan 637000, China
| | - Gangrong Wang
- Department of Laboratory Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China; Department of Laboratory Medicine, North Sichuan Medical College, Nanchong, Sichuan 637000, China; Translational Medicine Research Center, North Sichuan Medical College, Nanchong, Sichuan 637000, China
| | - Qin Du
- Department of Laboratory Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China; Department of Laboratory Medicine, North Sichuan Medical College, Nanchong, Sichuan 637000, China; Translational Medicine Research Center, North Sichuan Medical College, Nanchong, Sichuan 637000, China
| | - Guoyuan Zhang
- Department of Laboratory Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China; Department of Laboratory Medicine, North Sichuan Medical College, Nanchong, Sichuan 637000, China; Translational Medicine Research Center, North Sichuan Medical College, Nanchong, Sichuan 637000, China
| | - Xiaolan Guo
- Department of Laboratory Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China; Department of Laboratory Medicine, North Sichuan Medical College, Nanchong, Sichuan 637000, China; Translational Medicine Research Center, North Sichuan Medical College, Nanchong, Sichuan 637000, China.
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